Sprinkler base



FIG. 1 is a perspective view of a sprinkler base showing my new design;

FIG. 2 is a top elevational view showing the design for the sprinkler base of FIG. 1;

FIG. 3 is a bottom elevational view showing the design for the sprinkler base of FIG. 1;

FIG. 4 is a left side elevational view showing the design for the sprinkler base of FIG. 1;

FIG. 5 is a right side elevational view showing the design for the sprinkler base of FIG. 1;

FIG. 6 is a front elevational view showing the design for the sprinkler base of FIG. 1; and,

FIG. 7 is a rear elevational view showing the design for the sprinkler base of FIG. 1.

The broken line showing of portions of the sprinkler base is included for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a sprinkler base, as shown and described. 